Lesson objective: Compare figures with different attributes to solve problems.

This lesson provides an opportunity for students to apply their knowledge and understanding of classifying two-dimensional figures to a real-life situation. Students are asked to determine if a collection of different shaped cookies has the attributes belonging to a particular set.

Key Concept students will use:

- because figures may belong to categories and subcategories, we can classify figures in a hierarchy based on properties

Skills students will use:

- understand shapes in different categories (rhombuses, rectangles, etc.) may share attributes; (Grade 3, Unit 13)
- read and create diagrams to show relationships between categories and subcategories of shapes
- evaluate hierarchical relationships based on shared attributes

Students engage in Mathematical Practice 3 (construct viable arguments and critique the reasoning of others) as they consider the claims of others in regards to the classification of two-dimensional figures, and make judgements on their reasoning based on their understanding of the classification of plane figures.

**Key vocabulary: **

- attribute
- hierarchy
- kite
- parallelogram
- quadrilateral
- trapezoid